intromission

noun5

1. •
   Putting one thing into another; introduction (into); insertion
2. •
   Copulation: usually the first moment of initial entry of a penis into a vagina, mouth or anus.
3. •
   The state of being allowed to enter; admittance
4. •
   The act of allowing to enter; admission
5. •
   (Scotland) An intermeddling with the affairs of another, either on legal grounds or without authority.